Stylisma pickeringii (Torrey ex M.A. Curtis) A. Gray var. pickeringii . Pickering's Dawnflower. Phen: (May-) Jun-Aug (-Sep); Jul-Sep. Hab: Longleaf pine sandhills, usually in the driest, most barren, deep-sand areas, occasionally colonizing dry, disturbed areas in sandhills, such as sandy roadbanks, known from the Fall-line Sandhills, aeolian rims of Carolina bays, and sandhills on relict riverine dunes along Coastal Plain rivers. Dist: Var. pickeringii ranges from s. NC south through SC, GA, AL, and e. MS, with a disjunct area in the Pine Barrens of s. NJ, sometimes treated as a separate variety "caesariensis" (see synonymy).

ID notes:Stylisma pickeringii is easily recognizable by its growth form, with numerous stems arching from a central point, then trailing radially away, forming a mound 1-2 meters in diameter. The narrowly linear leaves are borne vertically.

Origin/Endemic status: Endemic

Taxonomy Comments: Fernald and Schubert (1949) named four varieties in this widely but disjunctly distributed species; Myint (1966) reduced this to two varieties, one eastern and one western.

Synonymy: = C, FNA14, K1, K3, K4, Myint (1966); < Bonamia pickeringii (Torr. ex M.A.Curtis) A.Gray – RAB, Shinners (1962d), Wilson (1960b); < Breweria pickeringii (Torr. ex M.A.Curtis) A.Gray – G; > Breweria pickeringii (Torr. ex M.A.Curtis) A.Gray var. angustifolia (Choisy) Fernald & Schub. – Fernald & Schubert (1949); > Breweria pickeringii (Torr. ex M.A.Curtis) A.Gray var. caesariensis Fernald & Schub. – F, Fernald & Schubert (1949); > Breweria pickeringii (Torr. ex M.A.Curtis) A.Gray var. cuthbertii Fernald & Schub. – Fernald & Schubert (1949); > Breweria pickeringii (Torr. ex M.A.Curtis) A.Gray var. pickeringii – F, Fernald & Schubert (1949); < Stylisma pickeringii (Torr. ex M.A.Curtis) A.Gray – S

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FAC (taxonomic split from wetland indicator species)
• Great Plains: FAC (taxonomic split from wetland indicator species)
• Midwest: UPL (taxonomic split from wetland indicator species)

Heliophily: 9